JPH0155403B2 - - Google Patents
Info
- Publication number
- JPH0155403B2 JPH0155403B2 JP54067761A JP6776179A JPH0155403B2 JP H0155403 B2 JPH0155403 B2 JP H0155403B2 JP 54067761 A JP54067761 A JP 54067761A JP 6776179 A JP6776179 A JP 6776179A JP H0155403 B2 JPH0155403 B2 JP H0155403B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical fiber
- optical
- fiber
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000013307 optical fiber Substances 0.000 claims description 26
- 239000000835 fiber Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 230000004927 fusion Effects 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 description 9
- 238000007526 fusion splicing Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/35—Testing of optical devices, constituted by fibre optics or optical waveguides in which light is transversely coupled into or out of the fibre or waveguide, e.g. using integrating spheres
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Description
【発明の詳細な説明】
本発明は光通信などに使用される光フアイバに
おける接続損失の測定方法にかかり、特に、光フ
アイバの融着接続点に外部から散乱光を照射し、
その光フアイバの開放端に設置した光検出器の出
力レベルを基準信号レベルと比較することによつ
て、簡単且つ確実に接続損失を測定するものに関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring splice loss in optical fibers used for optical communications, etc., and in particular, irradiates scattered light from the outside to a fusion splice point of an optical fiber.
The present invention relates to a method for simply and reliably measuring splice loss by comparing the output level of a photodetector installed at the open end of the optical fiber with a reference signal level.
一般に、二つの光フアイバを融着接続した場合
に、その接続によつて生じる光の接続損失は互に
衝き合せられるコア径の違い、屈折率の差、コア
どうしの軸ずれあるいは軸の角度ずれなどが原因
となつて生じる。したがつて、融着接続の際には
これらの点を注意して諸作業が行われる訳である
が、その作業時その接続状態が良好であるか否
か、換言すれば、その光フアイバが実用できるか
否かの判定をする必要がある。 In general, when two optical fibers are fusion spliced, the optical splice loss that occurs due to the splicing is due to differences in core diameters that collide with each other, differences in refractive index, misalignment of the cores' axes, or angular misalignment of the axes. This is caused by things like. Therefore, when performing fusion splicing, various operations are carried out paying attention to these points, but it is important to check whether the splicing condition is good or not, in other words, whether the optical fiber is in good condition or not. It is necessary to judge whether it is practical or not.
従来、かかるフアイバの融着接続状態の良否を
判定する方法として、第１図に示すような接続損
失を測定する手段が広く用いられている。 Conventionally, as a method for determining the quality of the fusion splicing of such fibers, a means for measuring splice loss as shown in FIG. 1 has been widely used.
第１図は二本の光ケーブル１，２の光フアイバ
３，４どうしの接続を行う場合を示し、光ケーブ
ル１のフアイバ３の入力側には発光ダイオードな
どの光源５が設置され、その入力端面に適当な手
段例えば必要なレンズ系などを介して集光するよ
うになつている。 FIG. 1 shows a case in which optical fibers 3 and 4 of two optical cables 1 and 2 are connected to each other. A light source 5 such as a light emitting diode is installed on the input side of the fiber 3 of the optical cable 1, and a light source 5 such as a light emitting diode is installed on the input end surface. The light is collected by suitable means, such as a necessary lens system.
また、その光源５の入射パワーを予じめパワー
メータなどにより測定しておく。 Further, the incident power of the light source 5 is measured in advance using a power meter or the like.
なお、上記集光操作は入射パワーが適当なレベ
ルであれば必ずしも必要ではない。また、フアイ
バ３，４の融着接続部にはパワーメータ６が設置
され、フアイバ４の出力端側にもパワーメータ７
が設置される。 Note that the above-mentioned light focusing operation is not necessarily necessary as long as the incident power is at an appropriate level. Further, a power meter 6 is installed at the fusion spliced portion of the fibers 3 and 4, and a power meter 7 is installed at the output end of the fiber 4.
will be installed.
また、これら二つのパワーメータ６，７の入出
力特性は同一に較正しておく。 Further, the input and output characteristics of these two power meters 6 and 7 are calibrated to be the same.
次に、かかる構成になる測定システムによる接
続損失の測定方法について説明する。 Next, a method for measuring splice loss using a measurement system having such a configuration will be described.
先ず、融着接続部分における接続前のフアイバ
３からの出射パワーをパワーメータ６によつて測
定する。その測定値をPAとする。 First, the power emitted from the fiber 3 at the fusion spliced portion before splicing is measured using the power meter 6. Let the measured value be P A.
次に、上記フアイバ３の出力端とフアイバ４の
入力端を融着接続し、フアイバ４の出力端にパワ
ーメータ７を接続して、その出射パワーを測定す
る。この測定値をPBとする。そして上記フアイ
バ４の光損失Plを予じめ測定しておくと、PA、
PB、Plと接続損失PLとの間には次の式が成立す
る。 Next, the output end of the fiber 3 and the input end of the fiber 4 are fusion-spliced, and a power meter 7 is connected to the output end of the fiber 4 to measure the output power. Let this measured value be P B. If the optical loss Pl of the fiber 4 is measured in advance, then P A ,
The following equation holds between P B , Pl, and connection loss P L .
PL＝PA−PB−Pl
すなわち、上記測定方法によれば、二つのパワ
ーメータ６，７と光源５とによりPA、PBを別々
に測定し、フアイバ４自体の光損失Plを予じめ測
定し、上記の式を計算することによつて初めて接
続損失が求めらることとなる。 P L = P A − P B − Pl In other words, according to the above measurement method, P A and P B are measured separately using the two power meters 6 and 7 and the light source 5, and the optical loss Pl of the fiber 4 itself is calculated. The splice loss can only be determined by measuring in advance and calculating the above formula.
すなわち、測定器を測定箇所ごとに設ける必要
があり不経済であるばかりか、測定手順が面倒で
ある。 That is, it is necessary to provide a measuring device for each measurement location, which is not only uneconomical but also requires a troublesome measurement procedure.
本発明はかかる従来の問題点を改善するもので
あり、その目的とするところは、光フアイバの融
着接続点に光フアイバの近軸方向の光を照射し、
それを光フアイバの端末部で検出し、その検出出
力レベルを基準レベルに対してどのような値であ
るかを検出することにより、迅速かつ確実に接続
損失を測定しうる方法を提供することにある。 The present invention is intended to improve such conventional problems, and its purpose is to irradiate the fusion splicing point of the optical fiber with light in the paraxial direction of the optical fiber,
We aim to provide a method that can quickly and reliably measure splice loss by detecting it at the terminal of the optical fiber and determining what value the detected output level is relative to the reference level. be.
以下に、本発明の実施例を図面に基づいて説明
する。 Embodiments of the present invention will be described below based on the drawings.
第２図は本発明にかかる測定方法を示すシステ
ム図であり、８，９は互いに接続された二本の光
フアイバで、その接続部分Ｘは例えば第３図に示
すようにコア１０，１１の各出力端および入力端
が融着接続されている。 FIG. 2 is a system diagram showing the measuring method according to the present invention, and 8 and 9 are two optical fibers connected to each other, and the connecting portion X is, for example, the core 10, 11 as shown in FIG. Each output end and input end are fusion spliced.
なお、１０′，１１′は１０，１１をそれぞれお
おうジヤケツトである。また第４，５図に示すよ
うにこの接続部をはさんで一方に光散乱用のデフ
ユーザ１３が、他方にクセノンランプ等の強力な
光源１４が配置される。 Note that 10' and 11' are jackets that cover 10 and 11, respectively. Further, as shown in FIGS. 4 and 5, a differential user 13 for light scattering is placed on one side of this connection, and a powerful light source 14 such as a xenon lamp is placed on the other side.
なお、１５は上記光源１４の上記接続点Ｘとは
反対側に位置された放物線状の集光ミラーであ
る。かかる光学系では光源１４から投光された光
は集光されてデフユーザ１３に向つて反射し、デ
フユーザ１３で散乱して光フアイバの近軸方向の
光がつくりだされ、この近軸方向の光が上記の接
続点Ｘに放射される。なお、上記の光源１４はそ
れがクセノンランプである場合には放電回路１６
によつて駆動され、その放電回路の動作を安定化
するため、光源１４の近傍に設置した光検出素子
１７によつて光出力を制御回路１８にフイードバ
ツクして、放電特性の安定化を図るように制御動
作を行なわしめている。 Note that 15 is a parabolic condensing mirror located on the opposite side of the connection point X of the light source 14. In such an optical system, the light projected from the light source 14 is condensed and reflected toward the differential user 13, and is scattered by the differential user 13 to create light in the paraxial direction of the optical fiber. is radiated to the connection point X above. Note that if the light source 14 is a xenon lamp, the discharge circuit 16
In order to stabilize the operation of the discharge circuit, the light output is fed back to the control circuit 18 by a photodetection element 17 installed near the light source 14 to stabilize the discharge characteristics. control operations are performed.
一方、上記光フアイバ９の出力端には光電変換
素子などの光検出素子２２が設置され、これにア
ンプ１９、ピークホールド回路２０および表示装
置２１が接続されている。ここでは光フアイバ９
のコアを通る光量が光検出素子２２で電気信号に
変換され、アンプ１９で増巾されてＡに示す波形
信号を得るとともに、ピークホールド回路２０で
その波形のピークレベルをＢに示すようにホール
ドして、そのホールドされたレベルを表示装置２
１にて表示する。この場合において、上記光源１
４の基準情報およびその光源１４の基準値に対す
る光フアイバ９の光損失性報が予じめ上記表示装
置２１内の比較回路（図示しない）の一方の入力
端子に供給されていて、他の入力端子に入力され
た上記ピークホールド信号と比較されて、その差
分に応じた接続損失を表示する。 On the other hand, a photodetecting element 22 such as a photoelectric conversion element is installed at the output end of the optical fiber 9, and an amplifier 19, a peak hold circuit 20, and a display device 21 are connected to this. Here, optical fiber 9
The amount of light passing through the core is converted into an electrical signal by the photodetecting element 22, amplified by the amplifier 19 to obtain the waveform signal shown in A, and the peak level of the waveform is held by the peak hold circuit 20 as shown in B. and display the held level on display device 2.
Displayed at 1. In this case, the light source 1
4 and the optical loss property information of the optical fiber 9 with respect to the reference value of the light source 14 are supplied in advance to one input terminal of a comparator circuit (not shown) in the display device 21, and the other input terminal It is compared with the peak hold signal inputted to the terminal, and the connection loss is displayed according to the difference.
そこで、上記システムにより本発明の測定方法
について説明する。 Therefore, the measurement method of the present invention using the above system will be explained.
先ず、上記光源１４を制御回路１８によつて安
定駆動し、デフユーザ１３を介して光フアイバ
８，９の接続点Ｘに光フアイバの近軸方向の光を
照射する。その照射光線は第３図矢印に示すよう
に一方の例えばコア１０の端面から進入する。 First, the light source 14 is stably driven by the control circuit 18 to irradiate light in the paraxial direction of the optical fibers to the connection point X of the optical fibers 8 and 9 via the differential user 13. The irradiation light enters from one end surface of the core 10, for example, as shown by the arrow in FIG.
ここで、各コア１０，１１の端面が完全に軸合
せ融着されている場合には、近軸方向の光がコア
１０，１１内に進入する光量は少ないが、上記の
ように軸ずれなどがあると、各コア１０，１１の
端面から光が多量に進入し、それが光検出器２２
で検出される。そしてその光量の大きさは軸ずれ
の大きさなどにほぼ比例する関係にあると見られ
るので、各コア１０，１１を通る光量が大きい場
合には接続損失が大きいということになる。 Here, if the end faces of each core 10, 11 are completely axially aligned and fused, the amount of light in the paraxial direction entering the cores 10, 11 is small, but as mentioned above, axis misalignment etc. If there is, a large amount of light enters from the end face of each core 10, 11, and it is detected by the photodetector 22.
Detected in Since the amount of light appears to be approximately proportional to the amount of axis misalignment, it follows that if the amount of light passing through each core 10, 11 is large, the connection loss will be large.
そして光検出器２２で得られた電気信号レベル
は光量に対応するものであり、その最大値を被検
出信号としてピークホールド回路２０でピークホ
ールドして、そのピークレベルを既述の基準レベ
ルの信号と比較し演算して表示装置２１に出力
し、ここで接続損失に換算された値として表示さ
れる。そして実用的には接続損失が0.3〜0.4dBを
上限として、これ以上ではその光フアイバを廃棄
するなど、適当な処置を採ることができる。 The electrical signal level obtained by the photodetector 22 corresponds to the amount of light, and its maximum value is held as a detected signal in the peak hold circuit 20, and the peak level is used as the reference level signal described above. It is calculated and outputted to the display device 21, where it is displayed as a value converted to connection loss. Practically speaking, the upper limit of the connection loss is 0.3 to 0.4 dB, and if it exceeds this, appropriate measures can be taken, such as discarding the optical fiber.
以上のように、本発明によれば、外部から光フ
アイバの融着接続点に光フアイバの近軸方向の光
を照射し、その光フアイバ端でその光量を検出す
ることにより、接続状態に対応する光量から容量
且つ確実に接続損失の測定ならびに処置を講ずる
ことができる。 As described above, according to the present invention, light in the paraxial direction of the optical fiber is irradiated from the outside to the fusion splicing point of the optical fiber, and the amount of light is detected at the end of the optical fiber, thereby responding to the connection state. It is possible to accurately and reliably measure the connection loss and take measures based on the amount of light.
そしてかかる方法によれば異つた測定器を二箇
所に設定するのみで各機器の特性を合せる必要が
なくなるとともに、その測定作業が自動化され極
めて実用性に富むなど実用上諸々の利点がある。 This method has various practical advantages, such as simply setting up different measuring instruments at two locations, eliminating the need to match the characteristics of each device, and automating the measurement work, making it extremely practical.
第１図は従来から実施されている光ケーブルに
おける接続損失の測定方法のシステム図、第２図
は本発明にかかる接続損失の測定方法を示すシス
テム図、第３図は光フアイバの融着接続部の拡大
図、第４図および第５図は同じく光源付近の要部
の側面図および平面図である。
８，９……光フアイバ、１４……光源、２２…
…光検出器、２１……表示装置、Ｘ……融着接続
部。
Figure 1 is a system diagram showing a conventional method for measuring splice loss in optical cables, Figure 2 is a system diagram showing a method for measuring splice loss according to the present invention, and Figure 3 is a fusion splice of optical fibers. The enlarged view, FIGS. 4 and 5 are a side view and a plan view of the main parts near the light source. 8, 9...Optical fiber, 14...Light source, 22...
...Photodetector, 21...Display device, X...Fusion splicing part.
Claims (1)
せて、融着接続された光フアイバの近軸方向の光
をつくりだし、その近軸方向の光を光フアイバの
接続点に照射して前記接続点から光フアイバ内に
進入する光量を光フアイバ端において検出し、そ
の光量の大きさを測定することによつて接続損失
量を得るようにした光フアイバにおける接続損失
の測定方法。1. Light from an external light source is scattered by a differential user to create light in the paraxial direction of the fusion spliced optical fiber, and the paraxial light is irradiated to the connection point of the optical fiber to emit light from the connection point. A method for measuring splice loss in an optical fiber, in which the amount of light entering the fiber is detected at the end of the optical fiber, and the amount of splice loss is obtained by measuring the magnitude of the amount of light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6776179A JPS55159134A (en) | 1979-05-31 | 1979-05-31 | Measuring method of connection loss in optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6776179A JPS55159134A (en) | 1979-05-31 | 1979-05-31 | Measuring method of connection loss in optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55159134A JPS55159134A (en) | 1980-12-11 |
| JPH0155403B2 true JPH0155403B2 (en) | 1989-11-24 |
Family
ID=13354242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6776179A Granted JPS55159134A (en) | 1979-05-31 | 1979-05-31 | Measuring method of connection loss in optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55159134A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51107152A (en) * | 1975-03-18 | 1976-09-22 | Fujikura Ltd | Hikarifuaibano rokosokuteihoho |
-
1979
- 1979-05-31 JP JP6776179A patent/JPS55159134A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51107152A (en) * | 1975-03-18 | 1976-09-22 | Fujikura Ltd | Hikarifuaibano rokosokuteihoho |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55159134A (en) | 1980-12-11 |
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